<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <div class="todo-header">
        <input v-model="todoName" placeholder="请输入你的任务名称" type="text"/>
        <button class="btn btn-success" @click="addTodo">添加</button>
      </div>
      <ul class="todo-main">
        <li v-for="(todo,index) in todoList" :key="index">
          <label>
            <input v-model="todo.status" type="checkbox"/>
            <span>{{ index + 1 }}.{{ todo.todo }}</span>
          </label>
          <button class="btn btn-danger" @click="deleteTodo(index)">删除</button>
        </li>
      </ul>
      <div class="todo-footer">
        <label>
          <input v-model="allSelect" type="checkbox" @change="allSelectChange"/> 全选
        </label>
        <span>
            <span>已完成 {{ finished }}</span> / 全部 {{ total }}
          </span>
        <button class="btn btn-danger" @click="deleteSelectAll">清除已完成任务</button>
      </div>
    </div>
  </div>
</template>

<script>
import {defineComponent} from "vue";

export default defineComponent({
  name: "todo-list",
  data() {
    return {
      todoName: "",
      todoList: [
        {
          todo: "学习Vue",
          status: false
        },
        {
          todo: "学习Vue3",
          status: false
        },
      ],
      allSelect: false
    }
  },
  computed: {
    finished() {
      let count = 0;
      for (let todo of this.todoList) {
        if (todo.status) {
          count++;
        }
      }
      return count;
    },
    total() {
      return this.todoList.length;
    },
  },
  methods: {
    addTodo() {
      this.todoList.push({
        todo: this.todoName,
        status: false
      })
      this.todoName = "";
    },
    deleteTodo(index) {
      this.todoList.splice(index, 1)
    },
    deleteSelectAll() {
      //[1,(2),3,(4),5]
      // 0  1  2  3  4

      //[1,3,(4),5]
      // 0 1  2  3

      //[1,3,5]
      // 0 1 2


      //[1,(2),(3),4,5]
      // 0  1   2  3 4

      //[1,(3),4,5]
      // 0  1  2 3 4
      // for (let i = 0; i < this.todoList.length; i++) {
      //   if(this.todoList[i].status){
      //     this.todoList.splice(i,1)
      //     // this.todoList.unshift(this.todoList[i])
      //
      //   }
      // }


      //[1,(2),(3),4,5]
      // 0  1   2  3 4


      //[1,(2),4,5]
      // 0  1  2 3


      //[1,4,5]
      // 0 1 2
      // for (let i = this.todoList.length - 1; i >= 0; i--) {
      //     if(this.todoList[i].status){
      //       this.todoList.splice(i,1)
      //       // this.todoList.unshift(this.todoList[i])
      //
      //     }
      // }
      // this.todoList = this.todoList.filter((item)=>!item.status)
      this.todoList = this.todoList.filter(this.filterData)
    },
    filterData(item) {
      return !item.status
    },
    allSelectChange() {
      this.todoList.forEach((item) => {
        item.status = this.allSelect
      })
    }
  }
})
</script>

<style scoped>
/*header*/
.todo-header {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.todo-header input {
  width: 100%;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
  margin-right: 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}


/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
  min-width: 66px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn-success {
  color: #fff;
  background-color: #57a900;
  border: 1px solid #468847;
}


.btn-success:active {
  color: #fff;
  background-color: #468847;
  border-color: #46a000;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}

.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}

/*main*/
.todo-main {
  margin-left: 0px;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding: 0px;
}

.todo-empty {
  height: 40px;
  line-height: 40px;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding-left: 5px;
  margin-top: 10px;
}

/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}

li:hover {
  background-color: #ddd;
}

li:hover button {
  display: block;
}


/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
